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公开(公告)号：US12068008B2
公开(公告)日：2024-08-20
申请号：US18102975
申请日：2023-01-30
发明人： Wenyu Chen , Shohei Kawasaki , Tetsuya Roppongi
CPC分类号： G11B5/3146 , G11B5/11 , G11B5/1278 , G11B5/235 , G11B5/3133 , G11B5/314 , G11B5/3163 , G11B2005/0024 , G11B5/3912 , G11B5/3919 , G11B2005/3996
摘要： A STRAMR structure is disclosed. The STRAMR structure can include a spin torque oscillator (STO) device in a WG provided between the mail pole (MP) trailing side and a trailing shield. The STO device, includes: a flux guiding layer that has a negative spin polarization (nFGL) with a magnetization pointing substantially parallel to the WG field without the current bias and formed between a first spin polarization preserving layer (ppL1) and a second spin polarization preserving layer (ppL2); a positive spin polarization (pSP) layer that adjoins the TS bottom surface; a non-spin polarization preserving layer (pxL) contacting the MP trailing side; a first negative spin injection layer (nSIL1) between the ppL2 and a third spin polarization preserving layer (ppL3); and a second negative spin injection layer (nSIL2) between the ppL3 and the pxL, wherein the nFGL, nSIL1, and nSIL2 have a spin polarization that is negative.
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公开(公告)号：US20240135961A1
公开(公告)日：2024-04-25
申请号：US18359982
申请日：2023-07-26
CPC分类号： G11B5/11 , G11B5/1272 , G11B5/374 , G11B5/3912
摘要： According to one embodiment, a magnetic sensor includes first to sixth shields, first and second magnetic layers, a first member, and first to fourth terminals. The first magnetic layer is provided between the first shield and the second shield. The first magnetic layer is between the third shield and the fourth shield in the second direction. The second magnetic layer is provided between the first magnetic layer and the second shield. The second magnetic layer is between the fifth shield and the sixth shield in the second direction. The second magnetic layer is electrically connected to the fifth shield and the sixth shield. The first member includes a first region and a second region. The first region is provided between the third shield and the first magnetic layer. The second region is provided between the first magnetic layer and the fourth shield.
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公开(公告)号：US11756577B2
公开(公告)日：2023-09-12
申请号：US17534574
申请日：2021-11-24
发明人： Yan Wu
CPC分类号： G11B5/012 , G11B5/02 , G11B5/11 , G11B5/1278 , G11B5/315 , G11B5/3133 , G11B5/3146
摘要： A spin injection assisted magnetic recording structure is disclosed wherein a ferromagnetic (FM) layer and at least one spin preservation (SP) layer are formed between a main pole (MP) trailing side and a write shield (WS). Current (Ia) flows between the MP and WS, or is injected into the FM layer. As a result, the spin polarized electrons from the FM layer, which flow across one or two SP layers to generate a magnetization that enhances one or both of a local WS magnetization and return field, and a local MP magnetization and write field, respectively. A lead to the FM layer may be stitched to enable lower resistance and improve reliability. The FM layer may be recessed from the ABS to allow more overlap with the SP layer for lower current density while maintaining performance. Higher linear density and area density capability, and better reliability are achieved.
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公开(公告)号：US20230274761A1
公开(公告)日：2023-08-31
申请号：US18142938
申请日：2023-05-03
发明人： Quan-Chiu Harry LAM
CPC分类号： G11B5/315 , G11B5/484 , G11B5/187 , G11B5/3153 , G11B5/11 , G11B5/1276
摘要： Aspects of the present disclosure generally relate to a magnetic recording head that includes a main pole, a leading shield, a first side shield disposed on a first side of the main pole, a second side shield disposed on a second side of the main pole, and a trailing shield. The trailing shield is disposed on a trailing side of the main pole. One or more approaches are disclosed to control return-fluxes. In some embodiments, at least one of the upper return pole, the leading shield, the trailing shield, the first side shield, and the second side shield includes a laminate structure having at least a pair of ferromagnetic layers, and a non-magnetic spacer layer disposed between adjacent ferromagnetic layers. In some embodiments, one or more shunts are positioned, such as connecting the leading shield to the upper return pole in order to create circuits to control magnetic flux.
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公开(公告)号：US11682421B2
公开(公告)日：2023-06-20
申请号：US17359046
申请日：2021-06-25
IPC分类号： G11B5/48 , G11B5/265 , G11B5/29 , G11B5/008 , G11B5/23 , G11B5/39 , G11B5/115 , G11B5/11 , G11B15/26
CPC分类号： G11B5/3977 , G11B5/00813 , G11B5/115 , G11B5/23 , G11B5/265 , G11B5/2652 , G11B5/29 , G11B5/3958 , G11B5/3967 , G11B5/4893 , G11B5/11 , G11B15/26
摘要： The present disclosure generally relates to a tape drive including a tape head. The tape head comprises at least one same gap verify (SGV) module comprising a plurality of write transducer and read transducer pairs disposed on a substrate. Each pair comprises a null shield disposed between the write transducer and the read transducer. One or more of a position between the write transducer and the read transducer of each pair, a width, a height, a thickness, and a permeability of the null shield is adjusted to create a null region, and the read transducer is disposed in the null region. The SGV module is configured to write data to a tape using the write transducer of each pair and read verify the data written on the tape using the read transducer of each pair such that the write transducer and read transducer of each pair are concurrently operable.
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公开(公告)号：US11670331B2
公开(公告)日：2023-06-06
申请号：US17672016
申请日：2022-02-15
发明人： Kaori Kimura , Akihiko Takeo , Takuya Matsumoto
CPC分类号： G11B5/607 , G11B5/11 , G11B5/1278 , G11B5/6076 , G11B2005/0021
摘要： According to one embodiment, a magnetic disk device includes a rotatable disk-shaped recording medium, a magnetic head including a write head having a main magnetic pole that applies a recording magnetic field to the recording medium, an assist element that assists magnetic recording by the main magnetic pole, and a plurality of thermal actuators that control a head gradient with respect to the recording medium, and a controller which includes a detection unit configured to detect deterioration of the magnetic head, and changes a head gradient of the magnetic head by the thermal actuator according to the detected deterioration.
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公开(公告)号：US20230122220A1
公开(公告)日：2023-04-20
申请号：US18046359
申请日：2022-10-13
IPC分类号： G11B5/11
摘要： A reader of a magnetic recording head includes a sensor stack, a first side shield and a second side shield disposed on opposite sides of the sensor stack in a cross-track dimension, and a bridge. The bridge is configured to align magnetic moments of the first side shield and the second side shield. The bridge is disposed above the sensor stack relative to a media-facing surface of the magnetic recording head and proximate to the first side shield and the second side shield.
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公开(公告)号：US20220415355A1
公开(公告)日：2022-12-29
申请号：US17355590
申请日：2021-06-23
摘要： The present disclosure generally relates to a tape drive including a tape head. The tape head comprises at least one same gap verify (SGV) module comprising a plurality of write transducer and read transducer pairs disposed on a substrate. In each pair, the write transducer comprises a write pole having a height, and the read transducer comprises a first shield disposed adjacent to the write pole. The write pole and the first shield of each pair are spaced apart a distance greater than or equal to about 20% of the height of the write pole. The SGV module is configured to write data to a tape using the write transducer of each pair and read verify the data written on the tape using the read transducer of each pair such that the write transducer and read transducer of each pair are concurrently operable.
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公开(公告)号：US11514934B1
公开(公告)日：2022-11-29
申请号：US17512216
申请日：2021-10-27
发明人： Ming Mao , Chen-Jung Chien , Daniele Mauri , Goncalo Marcos Baião De Albuquerque , Chih-Ching Hu , Anup Ghosh Roy , Yung-Hung Wang
摘要： The present disclosure generally relates to a dual free layer (DFL) two dimensional magnetic recording (TDMR) read head. The read head comprises a first sensor, a first rear hard bias (RHB) structure disposed adjacent to the first sensor, an upper shield disposed over the first sensor and first RHB structure, a lower shield disposed over the upper shield, a second sensor disposed over the lower shield, and a second RHB structure disposed adjacent to the second sensor. A first surface of the first sensor is substantially flush or aligned with a first surface of the first RHB structure. A first surface of the second sensor is substantially flush or aligned with a first surface of the second RHB structure. The upper shield extends linearly from a media facing surface into the read head. The first lower shield is over-milled a greater amount of time than the second lower shield.
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公开(公告)号：US11514932B1
公开(公告)日：2022-11-29
申请号：US17359098
申请日：2021-06-25
发明人： Quang Le , Hongquan Jiang , Hisashi Takano , Cherngye Hwang , Xiaoyong Liu
摘要： The present disclosure generally relates to magnetic storage devices, such as magnetic tape drives, comprising a read head. The read head comprises a plurality of read sensors disposed between a lower shield having a first width in a stripe height direction and an upper shield. The plurality of read sensors comprise an antiferromagnetic layer and a free layer comprising a first layer and a second layer. A plurality of soft bias side shields disposed adjacent to and outwardly of the plurality of read sensors in a cross-track direction, each of the plurality of soft bias side shields having a second width in the stripe height direction less than the first width. Each of the plurality of soft bias side shields are spaced a first distance from the lower shield and a second distance from the upper shield, the first distance being substantially equal to the second distance.
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